content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.operators;
  
  import hu.akarnokd.reactive4javaflow.*;
  import hu.akarnokd.reactive4javaflow.impl.EmptySubscription;
  
  import java.util.Objects;
  import java.util.concurrent.*;
  
  public final class FolyamDefer<T> extends Folyam<T> {
  
      final Callable<? extends Flow.Publisher<? extends T>> publisherFactory;
  
      public FolyamDefer(Callable<? extends Flow.Publisher<? extends T>> publisherFactory) {
          this.publisherFactory = publisherFactory;
      }
  
      @Override
      protected void subscribeActual(FolyamSubscriber<? super T> s) {
          Flow.Publisher<? extends T> p;
  
          try {
              p = Objects.requireNonNull(publisherFactory.call(), "The publisherFactory returned a null Publisher");
          } catch (Throwable ex) {
              FolyamPlugins.handleFatal(ex);
              EmptySubscription.error(s, ex);
              return;
          }
  
          p.subscribe(s);
      }
  }
  